I have a Netgear LM1200 LTE modem that can provide failover services. As long as Wired Modem is working the traffic goes through cable modem and LTE modem when cable modem goes offline, LTE takes over. In both cases the LTE modem is in bridge mode meaning the ISP public IP (in my case Comcast or T-Mobile) is provided to R600VPN Wan port. All of my port forwarding rules work without issues. The problem is;

when the LTE modem switches from one ISP to other and assign the new IP to the routers WAN port, router has no idea that the Public  IP has changed. I can force it to get the new IP by disconnect/connect the wan port, but I won't be able to do it if I am remote. Is there a way to make the WAN port notice that there is no traffic and reset the port? I also thought of resetting the router every night, but it seems overkill, for something may happen once in a while.